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Interactions of heavy metals with mi...

Xu, Yuping.

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Interactions of heavy metals with minerals.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Interactions of heavy metals with minerals./
作者:	Xu, Yuping.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1994,
面頁冊數:	195 p.
附註:	Source: Dissertation Abstracts International, Volume: 55-06, Section: B, page: 2129.
Contained By:	Dissertation Abstracts International55-06B.
標題:	Geochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9427832

Interactions of heavy metals with minerals.
Xu, Yuping.

Interactions of heavy metals with minerals. - Ann Arbor : ProQuest Dissertations & Theses, 1994 - 195 p.

Source: Dissertation Abstracts International, Volume: 55-06, Section: B, page: 2129.

Thesis (Ph.D.)--The Ohio State University, 1994.

This dissertation is concerned with application of reactive barrier systems to immobilize the heavy metals in groundwater. The specific objective of this study is to examine the feasibility for the remediation method by means of laboratory experiments and theoretical calculations. Of particular interest are the interactions of metals Pb, Cd and Zn with mineral hydroxyapatite. The study reveals that the rate of Pb$\sp{2+}$ removal by hydroxyapatite in aqueous solution is rapid and that the reaction mechanisms are dominated by the dissolution of hydroxyapatite and the precipitation of lead apatites, which have very low solubilities in water over the pH range of common environmental concern. The results show that hydroxyapatite is capable of dissolving sufficient phosphate ions to promote lead precipitation and thus, can remove Pb from aqueous solutions. The reactions between hydroxyapatite and Zn$\sp{2+}$ and Cd$\sp{2+}$ are found to be controlled by surface complexation and coprecipitation with ion exchange and solid diffusion also possibly contributing to the overall sorption process. Cd$\sp{2+}$ coprecipitation appears to be more significant than that of Zn$\sp{2+}$.Subjects--Topical Terms:

539092
Geochemistry.

Interactions of heavy metals with minerals.
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245 1 0 $a Interactions of heavy metals with minerals.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1994
300 $a 195 p.
500 $a Source: Dissertation Abstracts International, Volume: 55-06, Section: B, page: 2129.
500 $a Adviser: Franklin W. Schwartz.
502 $a Thesis (Ph.D.)--The Ohio State University, 1994.
520 $a This dissertation is concerned with application of reactive barrier systems to immobilize the heavy metals in groundwater. The specific objective of this study is to examine the feasibility for the remediation method by means of laboratory experiments and theoretical calculations. Of particular interest are the interactions of metals Pb, Cd and Zn with mineral hydroxyapatite. The study reveals that the rate of Pb$\sp{2+}$ removal by hydroxyapatite in aqueous solution is rapid and that the reaction mechanisms are dominated by the dissolution of hydroxyapatite and the precipitation of lead apatites, which have very low solubilities in water over the pH range of common environmental concern. The results show that hydroxyapatite is capable of dissolving sufficient phosphate ions to promote lead precipitation and thus, can remove Pb from aqueous solutions. The reactions between hydroxyapatite and Zn$\sp{2+}$ and Cd$\sp{2+}$ are found to be controlled by surface complexation and coprecipitation with ion exchange and solid diffusion also possibly contributing to the overall sorption process. Cd$\sp{2+}$ coprecipitation appears to be more significant than that of Zn$\sp{2+}$.
520 $a The interactions of metals with minerals are examined in a more complex system involving a typical acid mine water and a mixture of quartz and calcite. The results indicate that concentrations of Fe, Al, Pb, and Cu can be significantly reduced in the acid mine water through mass-transfer reactions with the mixed solid, whereas concentrations of Cd and Zn in the solution appear to remain mostly in the solution phase. A relatively high sulfate concentration in the acid mine water may facilitate formation of metal sulfate complexes and minimize surface absorption of these metals.
520 $a Based on the experimental and theoretical study, a simple two-dimensional transport model is developed to assess the performance of a reactive barrier in the field. The model utilizes an analytical approach for steady-state flow in homogeneous aquifers and chemical equilibrium calculations to account for mass transfer.
590 $a School code: 0168.
650 4 $a Geochemistry. $3 539092
650 4 $a Hydrologic sciences. $3 3168407
650 4 $a Mineralogy. $3 516743
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710 2 $a The Ohio State University. $3 718944
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792 $a 1994
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9427832